JavaScript无法在IE和Chrome上运行？（在Firefox上运行）

Question

function ord(string) {
    var str = string + '',
        code = str.charCodeAt(0);
    if (0xD800 <= code && code <= 0xDBFF) { // High surrogate (could change last hex to 0xDB7F to treat high private surrogates as single characters)
        var hi = code;
        if (str.length === 1) {
            return code; // This is just a high surrogate with no following low surrogate, so we return its value;
            // we could also throw an error as it is not a complete character, but someone may want to know }
            var low = str.charCodeAt(1);
            return ((hi - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000;
        }
        if (0xDC00 <= code && code <= 0xDFFF) { // Low surrogate return code; // This is just a low surrogate with no preceding high surrogate, so we return its value;
            // we could also throw an error as it is not a complete character, but someone may want to know
        }
        return code;
    }
}

$(document).ready(function () {
    var maxTxtNumber = 8;
    var arrTxtNumber = new Array();
    var txtvalues = new Array();
    var arr = {};

    $('.numericonly').keypress(function (e) {
        var t = $(this).val();
        var k = e.which;
        delete arr[8];
        if ((e.which >= 49 && e.which <= 55) || e.which == 8) {
            if (e.which == 8) {
                var s = new String(t);
                s = s.charCodeAt(0);
                delete arr[s];
            }
            if (arr[k]) {
                e.preventDefault();
            } else {
                arr[k] = e.which;
            }
        } else {
            e.preventDefault();
        }
    });
});

The code works on firefox but not on IE and chrome?

Sir/Ma'am your answers would be of great help. Thank you++

Answer 1

我建议通过诸如http://www.jslint.com/之类的验证器运行您的代码，以确保所有内容都符合通用标准。

Answer 2

Other browsers use e.keyCode to tell you which key was pressed. Cross-browser:

var k = e.keyCode || e.which;

Also make sure you use k rather than repeating e.which every time.

Answer 3

All that code is not required. If you want to test that an input's value is only digits, then something like the following will do:

<input type="text" onblur="check(this);" ...>


function check(el) {
  if (!isDigits(el.value)) {
    alert('Hey!!\nThe element you just left should only contain digits');
  }
}

function isDigits(s) {
  return /^\d*$/.test(s);
}

It's much more friendly to give the user a hint about the format you require and wait until they either leave the control or submit the form before offering a warning about invalid values. You really don't care how the user gets to a valid value, just so long as it's valid when the form is submitted.

And you must validate on the server again.